A. 2 CO(g)+O2(g)⇌2 CO2(g)2 ~\mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) \rightleftharpoons 2 ~\mathrm{CO}_{2}(\mathrm{g})2 CO(g)+O2(g)⇌2 CO2(g)
B. 2 SO2(g)+O2(g)⇌2 SO3(g)2 ~\mathrm{SO}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) \rightleftharpoons 2 ~\mathrm{SO}_{3}(\mathrm{g})2 SO2(g)+O2(g)⇌2 SO3(g)
C. 2 H2O(g)⇌2 H2(g)+O2(g)2 ~\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightleftharpoons 2 ~\mathrm{H}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})2 H2O(g)⇌2 H2(g)+O2(g)
D. 3 H2(g)+N2(g)⇌2 NH3(g)3 ~\mathrm{H}_{2}(\mathrm{g})+\mathrm{N}_{2}(\mathrm{g}) \rightleftharpoons 2 ~\mathrm{NH}_{3}(\mathrm{g})3 H2(g)+N2(g)⇌2 NH3(g)
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